Extracting method of D-xylose and L-arabinose

Abstract

The invention provides an extracting process of D-xylose and L-arabinose. The extracting process comprises the following steps of: acidizing forestry and agricultural residues, carrying out steam explosion on the acidized forestry and agricultural residues to obtain the forestry and agricultural residues subjected to steam explosion, and finally carrying out aqueous extraction, separation and crystallization to obtain the D-xylose and L-arabinose. According to the technical scheme of the invention, the extracting method has the following advantages that an acid solution is recycled, and therefore the acid consumption is reduced; as the acid in an extracting solution is low in content, the load of a later-peroid purifying treatment is lightened; the peroid is short, continuous steam explosion production can be achieved, and the equipment investment is reduced when the capacity is unchanged; steam is not heated together with the acid solution in the boosting process, so that the steam consumption is greatly reduced, and energy sources are saved; and as the process of separating the D-xylose and the L-arabinose first and then respectively crystallizing is adopted, the purity of massecuite during crystallization of the D-xylose is improved, and the quality and crystallization yield of the D-xylose are improved.

Description

technical field [0001] The invention belongs to the technical field of functional sugar preparation, in particular to a method for extracting xylose and arabinose. Background technique [0002] D-xylose has the function of promoting the growth of bifidobacteria and intestinal peristalsis. It has been used as a food ingredient in Japan for decades and is an excellent representative of functional sugar. It can also be directly used as a healthy coloring agent in the baking industry, and is also a raw material for the production of xylitol. At present, although the existing xylose production process has been improved, it generally continues the technology of the former Soviet Union in the 1950s. [0003] L-arabinose has the function of inhibiting the absorption of sucrose and is a healthy food ingredient for weight management. It was selected into the list of new resource foods by the Ministry of Health in 2008 and is a star product among functional sugars. L-arabinose is a b...

AI Technical Summary

Problems solved by technology

[0004] The existing D-xylose extraction process is mainly acid hydrolysis of hemicellulose in agricultural and forestry wastes to obtain xylose hydrolyzate, which has the following disadvantages: (1) acid solution and sugar solution are mixed together, resulting in high acid consumption; (2 ) needs to be neutralized with an additional alkali, and the acid salt is removed by means of ion exchange. The burden of separation is heavy, resulting in high water consumption and resin consumption; (3) The hydrolysis temperature is 120°C, and the hydrolysis time is 120 minutes , the cycle of hydrolysis is longer, and the efficiency of hydrolysis is lower; (4) Since the temperature of the acid solution and the material must be raised at the same time when the temperature of the hydrolysis is raised, the steam consumption is very high

(5) The process of extracting D-xylose first and then extracting L-arabinose in the mother liquor reduces the crystallization yield of D-xylose, and the process is cumbersome and inefficient